Boring-machine



(No Model.)

D. FORNIRAS'BO.

Boring Machine.

No. 234,764. Patented Nov. 23, 1880.

7/WITNESSES A0 INVENTOR N.PETERS, riom-u'mocmrnen, WASHINGTON. D c

2 ATTORNEY UNITED STATES Fries.

DOMANEGO FORNIRASEO, OF BELTON, TEXAS.

BORING-MACHINE.

SPECIFICATION forming part of Letters Patent NO. 234,764, dated November 23, 1880.

Application filed October 2, 1880. (No model.) i

To all whom it may concern:

Beitknown that I, DOMANECO FoRNiRAsEo, of Belton, in the county of Bell and State of Texas, have invented a new and valuablelmprovement in Boring-Machines, and I do hereby declare a that the following is a full, clear,

.and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawings is a side elevation, partly in section. Fig. 2 represents details. Fig. 3 is a detail, partly in section.

Thisinvention has relation to boring and drilling machines; and it consists in the construction and novel arrangement of a circularly-adjustable rod carrying a pressure-screw, an adjustable arm arranged on said rod and having its end or head concave on its under side and provided with bearing indentations or punctures, and a brace having a bearing end corresponding in form to said bearing indentations or punctures, all as hereinafter fully shown and described.

In the accompanying drawings my invention is illustrated as attached to a vise holding the work by an arm, B, this arm being bolted to the fixed jaw of the vise, as shown in the drawings; or said arm may be attached to a table by means of screws passing through lugs a extending laterally therefrom.

A represents a squared rod, having at its upper end a horizontal arm, (3, which is of proper length to extend over the work, and is provided at its end with a threaded bearing, b, to receive the pressure-screw D, which is constructed with a hand-wheel or other handle easily worked with the left hand.

The lower end of the rod A is shouldered and provided with a journal, 0, which is seated in a bearing, d, in the end of the lower arm, B, so that the rod can be circularly adjusted therein to bring the upper arm or branch, 0, of the rod vertically over the work, its position being then secured by means of a setscrew, 0.

F represents an intermediatearm between the upper branch, 0, of the rod and the lower arm, B, in which it is stepped. This arm F is adjustable at different heights on the rod A, it being provided with a rectangular slot or bearing, j, which is designed to fit the rod,

and to be of sufficient length to allow some adjustment endwise as well as vertically on the rod, so that the outer end of the arm can be brought vertically under thepressure-screw. The outer end or head, Gr, of this adjustable arm is made concave underneath or 011 its bearing-face g, the curvature of the concavity being taken with a radius of about the length of the brace H. This concave surface is indented or punctured with a number of small bearings, 71, over its entire surface, as shown in the drawings.

The brace H, carrying the bit 70, is provided at its upper end with a bearing-point, l, which corresponds in form with the indented or punctured bearings h in the concave head G, with one of which it is engaged, after its position I is adjusted carefully with reference to the work, by turning the pressure-screw so as to bring the head Gr down upon the bearing end of said brace.

During the boring operation as the bit descends the bearing-head is kept in contact with the end of the brace by means of the pressure-screw. It may sometimes be necessary to readjust the arm F during the work or to move the bearing end of the brace from one indentation, h, to another, the concavity of the head G facilitating such adjustment, so that the bearing end of the brace can be kept normal to the bearing-face of the head.

The concave bearing-face 9 also facilitates boring when the line of work is somewhat oblique, the brace being always adjustable to have a square bearing on the face 9.

Having described this invention, what I claim, and desire to secure by Letters Patent, 1s-

The boring and drilling attachment consisting of the squared rod A, having the upper arm, 0, threaded at I), and the journal end 0 seated in the bearing dot the attachment-arm B, the vertically and horizontally adjustable arm F, its concave bearing-head Gr, having the indentations or punctures h, the pressure-screw D, and brace H, having a bearing end, Z, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

DOMANECO FORNIRASEO.

Witnesses:

R. H. TAYLOR, W. Y. MOFARLAND. 

